Hoist



Nov. 12, 1940.

M. c. NESBITT 2,221,359

HOIST Filed June 25, 1957 3 Sheets-Sheet 1 Hike.

INVENTOR Mic/zae/ CU/fillfl Nash/77.

a 54am- ATTORNEY Patented Nov. 12, 1940 Michael Oulluni Nesbitt, Victoria, British Cplumbia, Canada a Application June 23, 1937, Serial No. 149,974

13 Claims.

' invention relates to a hoist which'may be used for any purpose.

An object of the present invention is the pro vision of a hoist which may be operated without loss of power.

Another object is the provision of a hoist having only a single source of power.

Another object is the provision of a portable 1 hoist which may be set up as a complete, com

pact unit.

A further object is the provision of a portable hoist which may be used as an ordinary single or'two drum hoist or for skidder rigging or for counterbalancing buckets running to different stations in ashaft or for many other purposes.

A stillfurther object is the prov sion of a portable hoist of comparatively simpleconstructionandwhich may be very easily operated.

There are various types of hoists now in use 20 with differential couplings but most of these are so cumbersomethat they cannot be set up as a single, portable unit. Another disadvantage of the present hoists is that mostof them require more than onesource of power andthat they 26 necessarily must operate a great deal of the time against their brakes resulting in a great loss of power. V

The present invention provides a, hoist having a single source of power which may be directly 30' connected to either or both the drums and which may also be connected to said drums through a differential whereby the drums may be held in constant relation or when one drum is braked the other may be wound or unwound as desired.

35 With this hoist there is no waste of power since it is so constructed that the drums do not rotate against the drag of a brake when one drum is pulling the cable off the other. The drums, the

differential and the source of power may be conveniently mountedon a sled or truck for transportation.

This invention consists essentially of a pair of independently mounted drums selectively con nected to each other. and to -a source of power 4 by gears. These drums are also independently connected to the source of power through a differential. There is a clutch for disconnecting the differential from the source of power and a brake on the shaft leading to said differential by 50 means of which the latter may be held stationary, The differential is mounted beneath scribed in the followingspeciflcation and illustrated in the accompanying drawings, in which Figure 1 is a side elevation of the hoist with the side frame removed,

Figure 2 is a plan view of the hoist, 5 Figure 3 is an elevation of the side of the hoist opposite thatshown in Figure l with certain parts broken away,

Figure .4 is a vertical section taken on the line 4-4 of Figure 3,

Figure 5 is a fragmentary plan view of the hoist with one of the cable drums removed,

Figure 6 diagrammatically illustrates one use for the hoist,

Figure 7 diagrammatically illustrates another use for the hoist, and

Figure 8 diagrammatically illustrates still another use for the hoist.

Referring more particularly to the drawings, [0 is a base having side frames II and I2 adapted to support the drums and their operating gears. A cable drum I3 is freely and slidably mounted on a shaft [4 journalled in bearings 15 formed on the side frames .H and I2 and a cable drum I5 is freely and slidably mounted on a shaft I! journalled inbearings l8 formed on said side frames. The drum I3 is provided at one end with a spur gear 20 and at its other end with a brake drum 2| engaged by a brake band 22 one end of which is anchored to an arm 24 34 supported by the frame l2 and the other end of the band is connected to a cam 25 secured to a brake rod 26 having an operating pedal 21. The drum I6 is provided at one end with a spur gear 28 substantially opposite the brake drum 2| of. the drum l3 and at its other end with a brake drum 3|] engaged by a brake band 3| one end of which is anchored at 32, the other end of said band being connected to a cam 33 secured to a brake rod 34 having an operating pedal 35.

A spur gear 36 is fixedly mounted on the shaft l4 adjacent the brake drum 2! of the drum i3 and is provided with a friction cone 31 adapted to extend into a conical recess 38 in the brake drum. Any suitable clutch mechanism such as diagrammatically illustrated at 40 is mounted on the opposite end of the shaft 14 and is adapted selectively to thrust the drum l3 into engagement with the friction cone 3?, said clutch mechanism being operated by a handle 4|. Similarly, a spur gear 42 is fixedly mounted on the shaft I1 adjacent the spur gear 28 of the drum l6 and is provided with a friction cone 43 adapted to extend into a conical recess 44 formed within the gear 28. Any suitable clutch mechanism The spider gears 53 rotate the bevel gear gear 55 rotates the shaft 51, gear 16 and the spur gear 28 which causes thedrum I6 to reel in. Sim ilarly if the friction cones 31 and 43 are disen-. gaged from their drums and the differential engaged with the engine with the drum. I6 braked, the drum I3 will reel in. The housing 56 rotates but the bevel gear 55 is held stationary due to the braking of drum I6. .The spider gears 53 rotate the bevel gear 54 in thesame direction as the housing 56. The bevel gear 54 rotates the shaft 56, gear 15 and the spur gear 26 which causes the drum I3 to reel. in.

If ,both the brakes 22 and 3| are off and the differential drive shaft engaged with the engine, either or both the drums I3 and I6 will reel in depending on the pulls on the cables 96 and 9| since thepull on either one of the cables may be the equivalent to braking its drumr In fact, the pull on onecable might be sufficient toreeloutone drum causing the other drum to reel in more quickly. In thiscase, the total amount of cable out would be reduced as long as the differential drive was engaged. If the differential drive shaft 63 is disengaged from the engine and the brake 61is oif, either of the drums could be reeled in or unreeled independently of the other, as the relative motion would only result in the rotation of the shaft 63.

If it is desired to unreel either or both the drums by power it would be necessaryonly to incorporate a reverse gear system in the transmission box 65 so that the above described difl ferential actions would be reversed. For example, with a reverse gear system in the transmission box 65, the differential shaft ,63 could be made to rotate in a direction opposite tothat shown by the arrow in Fig. 1. In this case, if the friction cones 31 and 43 are disengaged from their respective drums and the differential drive shaft 63 engaged with the engine with the drum I3 braked, the drum I6 Will unreel. The housing 56 rotates in the opposite direction to that previously described and the bevel gear 54 is held stationary due to the braking of the drum I3. The spider gears 53 rotate the bevel gear 55 inthe same direction as the housing 56. The bevel gear 55 rotates the shaft 51, gear 16 and the spur gear 28 which causes the drum I6 to unreel.

, Similarly, in this example, if the friction cones 31 and 43 are disengaged from their drums and thedifferential engaged with the engine with the drum I6 braked,,the drum I3 will unreel. The

housing 56 rotates in the reverse direction and the bevel gear 55 is held stationary due to the braking of the drum I6. The spider gears 53 rotate the bevel gear 54 in the same direction as greater than that of the other cable, thefirst cable will unreel faster than the second one.

When the load on the cables is equal, the both of the bevel gears 54 and 55 are locked with and rotate in the same direction as the housing 56 so that the gears 15 and 16'also rotate in the same direction to unreel the drums I3and I6 through the spur gears 26 and'26.

Any number of cable 'drums may be used with this hoist; The additional drums would be connected to the source of power through the gears 42, 11, 36 and 18. M

Figures 6, 7 and 8 illustrate, as examples, three ways in which this hoist may be employed. Figure 6 shows a method of picking up a load and moving it fromone spot to another. A sky line 94 extends from one support 95 to another sup-.

port 96 and a trolley 91 is adapted to be moved back and forth along said sky line. The cable 96 extends outwardly from the drum I3, through a lead block 98 mounted on the support 96, and is secured to the trolley 91. The cable 9I extends outwardly from the drum I6 and through a block I66 mounted on the trolley 91, said cable having a weight I6I and a hook I62 at its outer end. The trolley is moved towards the support 96 by reeling in cable 96 on to the drum I3 and allowing the cable 9I to unreel from the drum I6. This is done, as abovedescribed, by turning the handle II to engage the drum I3 with the friction cone 31 and by turning the handle 46 to disengage the drum I6 from the friction cone 43. Atthe same time, the differential drive shaft 63 is disengaged from the source of power by the lever 98 and held stationary by. the brake 61 operated by the lever 1 I. The load is lifted from the ground by braking the drum I3 to hold the trolley 91 stationary through the cable 96 and by reeling in cable 9| on to the drum I6 by means of the differential. The drum I6 and. the cable 9| might be reeled in by braking the drum I3, disengaging the differential drive shaft from the engine andengaging the drum I6 with the friction cone 43. When the load is clear of the ground, the brake 61 is applied to the differential shaft and the drum I6 is engaged with the friction cone 43 to reel in said drum. The drum I3 will unreel at the same speed as the drum I6 reels in so that the trolley will move towards the support 95.

The sizes of the drums I 3 and I6 will vary with the amount of cable wound thereon. If one drum is reeling in' its cable faster than the other drum is unreeling its cable, the brake 61 on the differential shaft should be released slightly to allow the one drum to unreel as fast as the other drum is reeling in. On the other hand, if one drum is unreeling its cable faster than the other drum is reeling in its cable, the differential drive shaft shouldbe turned over slowly to reduce the speed of the drum that is unreeling. When the trolley has reached the unloading point, the drum I3 is held stationary by itsbrake, and the drum I6 is released thus allowing the weight of the load to unreel the latter drum.

Another application of this hoist is illustrated in Figure '7, in which counterbalanced buckets I 63 and I64 are to be run to various stations, say, for example, stations I65, I66 and I61 in a shaft I68. With the brake 61 applied to the difi'eren tial shaft, the bucket I63 is moved to the station I65 by reeling in the drum I3 and the bucket I64 is allowed to drop to the station I61, the weight of said bucket being sufiic'ient to unreel the drum I6. Once the buckets are in this position, they may be operated between the stations I 65 and I61 by keeping the brake 61 on and alternately engaging one drum with its friction cone and disengaging the other drum from its friction cone. When it is desired to work between stations I65 and I66, the bucket I63 would be held at station I65 by braking the'drum I3 and the drum I6 reeled in bymean's of the differenat which. time the: bucketsmay .be worked -be.- tween these stations. as described Figure 8 illustrates another applicatiomof this hoist. In this. application,. a bucket. H0. is to be'moved back 'andtforth from one side to the other of a canyon III, the ground by reeling in bothof. the. drums. l3 audit and then. the brake E'Lis applied to the differential shaft. .To move the bucket Hi] from leftto right of Figure'.8,-. the cable 9| is reeled in. and the cableu90 is alloweclto unreel. When thebucket hasreachedthe desired point,xboth drums. are released and the weight of thebucket causes them to unreel. This procedure, is reversedwhen it is desired toxmove the bucket Hi]- from the right to the left of Figure 3.;

From. the above it willreadily be seen that a portable hoist has been provided which .is-opere ated by one source of power without loss of power. and in which .itsdrumsmaygbc counterbalanced one-againstthe other and reeled and unreeled both together and independently-of. each other by the single sourceof-power; Various modifications may be made in this invention without departing from the spirit. thereof or the scope of the claims, andtherefore the :exact forms shown are to be taken as iillustrativeonly and not in a limiting sense, and it is desired that only such limitations shall be, placed thereon as are disclosed in the prior, art or are set forth in the accompanyingiclaims.

. What I claim asmy invention is: P 1

- 1. In a hoist, a plurality, of cable drums,'means. for selectively connecting saiddrums to a single source of power, a differential connected'to the.

drums, a drive shaft adapted to connectthe differential to the source of power, means for. controlling the. direction of rotation of the drive shaft, means for connecting and disconnecting the drive shaft and the source of power, means for braking said drive shaft, and means for brak--. i-ng each of the drums, whereby said drums may be'oounterbalanced against each other and reeled and. unreeled both together andindependently. of each other by the single sourceof power.

2. In a hoist, a plurality-of cable drums, means for selectively connecting said drums to a single source of power, means for selectively braking. the drums, a differential connected to the. drums, a differential drive shaft, means for connecting and disconnectingthe drive shaft and the source of power, means for controlling the direction'of rotation of the drive shaft, and a brake on said shaft by means of which the shaft maybe held stationary, whereby said drums may be counterbalanced against each. other andreeled and unreeled both. together and independently of each other byathe single source of power.

3.1 In a hoist,- a'pl-urality of cable drums, a. spur gear. mounted :on one end of each, a brake mounted on=each drum at the end thereof ,remote from thespur (gear, the spur gearfiof each drum being adjacent the brake of the other drum, means for selectively connecting the drums to a single source of- -power, a differential condrums may be' ceunterbalanced against each other and reeled and unreeledboth together and? The. bucket is lifted Off independently-of each other by the singlesource In ahoist, a plurality of cable drums, spur ears mounted independently of the drums,. a gearjmeshing with the spur gears, said spur gears being-operatively connected to a single source-of-power means for selectively engaging thendrums with the spur gears, a differential adaptedto be connected to the same source of power. and toy the drums, means for connecting and disconnecting the differential and the source of.:-power,:and means for braking each drum,

whereby' said drums may be counterbalanced ears mounted independently of the drums, a'

gear meshing with the spur gears, said spur gears being rotatablyconnected to a single source of power, friction cones formed with the spur gears, means for selectively thrusting the drums into engagement with thefrictioncones-to rotate said drumsja differential adapted to be connected to the same .source of power and to the drums, means for connecting and disconnecting the differential and the source of power, and means for braking each drum, whereby said drums may be counterbalanced against each other and reeled and unreeled both together and independently of each 'otherbythe singlesource of power.

'6. In. a hoist, a plurality of cable-drums, spur gears mounted independently ofthe drums, a gear ,me'shing with the spur gears, said spur gears being rotatably connected'toa single source of power, friction c ones formed with thespur gearsgmeans for selectively thrusting the drums against each other and reeled and unreeled both together and independently of each other by the s nglesource. of power.

7. In a hoist, a plurality of cable drums, spur gears mounted independently of the drums, a

gear-meshing ,withfthe spur gears, said gears being operatively connected to a single source of power, means for; selectively engaging the drums with the spur gears, .a -differential connected to the drums, a drive shaft adapted to connect the differential to the source of power, means for connecting and disconnecting the drive shaft and the source ofpower, means for braking said drive shaft, and means for braking each drum,

whereby said drums. may be counterbalanced against each other and reeled and unreeled both together: and independently of each other by the singlesource of-power. 1

8. 'In a hoist, aplurality of cable drums, spur gears mounted independently of-the drums, a gear'meshing with'the spur gears,'said spur gears being rotatably connected to a single source of power, friction cones formed with the spur gears, means for selectively thrusting the drums into engagement with thefrictioncones to rotate said drums, means for selectively braking the drums, a differential connected" to the drums, a differential drive shaft; means for connecting and disconnecting the driveshaft and the source of power, and a brake on said shaft by means of which the shaft may be held stationary, whereby said drums may be counterbalanced against each other and reeled and unreeled both together and independently of each other by the single source of power.

9. In a hoist, a plurality of cable drums, spur gears mounted independently of the drums, a gear meshing with the spur'gears, said spur gears being rotatably connected to a single source of power, friction cones formed with the spur gears, means for selectively thrusting the drums into engagement with the friction cones to rotate the drums, spur gears mounted on the ends of the drums, brakes mounted on the opposite ends of the drums, a differential connected to the drums by gears meshing with the spur gears thereof, a differential drive shaft, means for connecting and disconnecting the drive shaft and the source of power, and a brake on the shaft by means of which said shaft may be held stationary whereby said drums may be counterbalanced against each other and reeled and unreeled both together and independently of each other by the single source of power.

10. In a hoist, a base having side frames, a plurality of cable drums freely mounted on shafts journalled in the side frames, a source of power mounted on the base at the rear of the drums, means for selectively connecting the drums to the source of power, a differential mounted on the base beneath one of the cable drums, said differential being connected to the drums, means for connecting and disconnecting the differential and the source of power, and means for braking the drums, whereby said drums may be counterbalanced against each other and reeled and unreeled both together and independently of each other by the single source of power.

11. In a hoist, a base having side frames, a plurality of cable drums freely mounted on shafts journalled in the side frames, friction cones fixedly mounted on the shafts, means for rotatably connecting the friction cones to a single source of power mounted on the base at the rear of the drums, means for selectively thrusting the drums into engagement with the cones to rotate the drums, means for braking the drums, a differential mounted on the base beneath one of the cable drums, means for connecting the differential to the drums, a drive shaft adapted to connect the differential to the source of power, and means for connecting and disconnecting the drive shaft and the source of power, whereby said drums may be counterbalanced against each other and reeled and unreeled both together and independently of each other by the single source of power.

12. In a hoist, a base having side frames, a plurality of cable drums freely mounted in shafts journalled in the side frames, spur gears fixedly mounted on the shafts, a gear freely mounted on another shaft meshing with the spur gears, means for rotatably connecting the spur gears to a sin gle source of power, friction cones formed with the spur gears, means for selectively thrusting the drums into engagement with the friction cones to rotate the drums, means for selectively braking said drums, a differential mounted on the base beneath one of the cable drums, means for connecting the differential to the drums, a differential drive shaft, means for connecting and disconnecting the shaft and the source of power, and means for braking said shaft, whereby said drums may be counterbalanced against each other and reeled and unreeled both together and independently of each other by the single source of power.

13. In a hoist, a base having side frames, a plurality of cable drums freely mounted on shafts journalled in the side frames, spur gears fixedly mounted on the shafts, a gear freely mounted on another shaft meshing with the spur gears, means for rotatably connecting the spur gears to a single source of power, friction cones formed with the spur gears, means for selectively thrusting the drums into engagement with the friction cones to rotate the drums, spur gears mounted on the ends of the drums, brakes mounted on the opposite ends of the drums, a differential mounted on the base beneath one of the cable drums, gears mounted on shafts extending outwardly from the differential adapted to mesh with the spur gears of the drums, a differential drive shaft, means for connecting and disconnecting the drive shaft and the source of power,

a brake on said shaft by means of which said shaft may be held stationary, whereby said drums may be counterbalanced against each other and reeled and unreeled both together and independently of each other by the single source of power.

MICHAEL CULLUM NESBITT. 

